I like the Gatorskins quite a bit myself and recommend them for folks who care about performance and ride feel, but also need a good bit of flat resistance.

That said I have been intrigued by the GB line of tires especially since both my gear weight and body weight are reduced from what I used to carry. I really would like to try them. I doubt I will try the GB tires any time soon though since I have a spare set of gatorskins sitting around in reserve.